75 lines
2.1 KiB
C++
75 lines
2.1 KiB
C++
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/**
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******************************************************************************
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* Xenia : Xbox 360 Emulator Research Project *
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******************************************************************************
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* Copyright 2013 Ben Vanik. All rights reserved. *
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* Released under the BSD license - see LICENSE in the root for more details. *
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******************************************************************************
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*/
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#include <xenia/core/memory.h>
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#include <sys/mman.h>
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/**
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* Memory map:
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* 0x00000000 - 0x40000000 (1024mb) - virtual 4k pages
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* 0x40000000 - 0x80000000 (1024mb) - virtual 64k pages
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* 0x80000000 - 0x8C000000 ( 192mb) - xex 64k pages
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* 0x8C000000 - 0x90000000 ( 64mb) - xex 64k pages (encrypted)
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* 0x90000000 - 0xA0000000 ( 256mb) - xex 4k pages
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* 0xA0000000 - 0xC0000000 ( 512mb) - physical 64k pages
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*
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* We use the host OS to create an entire addressable range for this. That way
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* we don't have to emulate a TLB. It'd be really cool to pass through page
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* sizes or use madvice to let the OS know what to expect.
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*/
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struct xe_memory {
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xe_ref_t ref;
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size_t length;
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void *ptr;
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};
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xe_memory_ref xe_memory_create(xe_pal_ref pal, xe_memory_options_t options) {
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xe_memory_ref memory = (xe_memory_ref)xe_calloc(sizeof(xe_memory));
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xe_ref_init((xe_ref)memory);
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memory->length = 0xC0000000;
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memory->ptr = mmap(0, memory->length, PROT_READ | PROT_WRITE,
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MAP_PRIVATE | MAP_ANON, -1, 0);
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XEEXPECTNOTNULL(memory->ptr);
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XEEXPECT(memory->ptr != MAP_FAILED);
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return memory;
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XECLEANUP:
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xe_memory_release(memory);
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return NULL;
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}
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void xe_memory_dealloc(xe_memory_ref memory) {
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munmap(memory->ptr, memory->length);
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}
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xe_memory_ref xe_memory_retain(xe_memory_ref memory) {
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xe_ref_retain((xe_ref)memory);
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return memory;
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}
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void xe_memory_release(xe_memory_ref memory) {
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xe_ref_release((xe_ref)memory, (xe_ref_dealloc_t)xe_memory_dealloc);
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}
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size_t xe_memory_get_length(xe_memory_ref memory) {
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return memory->length;
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}
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void* xe_memory_addr(xe_memory_ref memory, uint32_t guest_addr) {
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return (uint8_t*)memory->ptr + guest_addr;
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}
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